#include <string>
using namespace std;

class HasPtr {
public:
  HasPtr(const string &s = string())
      : ps(new string(s)), i(0), use(new size_t(1)) {}

  HasPtr(const HasPtr &p) : ps(p.ps), i(p.i), use(p.use) { ++*use; }

  HasPtr &operator=(const HasPtr &);
  ~HasPtr();

private:
  string *ps;
  int i;
  size_t *use;
};

HasPtr::~HasPtr() {
  if (--*use == 0) {
    delete ps;
    delete use;
  }
}

HasPtr &HasPtr::operator=(const HasPtr &rhs) {
  ++*rhs.use;
  if (--*use == 0) {
    delete ps;
    delete use;
  }
  ps = rhs.ps;
  i = rhs.i;
  use = rhs.use;
  return *this;
}